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WO2020011709A1 - Feuille de matériau multicouche réfléchissant nir - Google Patents

Feuille de matériau multicouche réfléchissant nir Download PDF

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Publication number
WO2020011709A1
WO2020011709A1 PCT/EP2019/068249 EP2019068249W WO2020011709A1 WO 2020011709 A1 WO2020011709 A1 WO 2020011709A1 EP 2019068249 W EP2019068249 W EP 2019068249W WO 2020011709 A1 WO2020011709 A1 WO 2020011709A1
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WO
WIPO (PCT)
Prior art keywords
layer
nir
reflective
material sheet
polymeric layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2019/068249
Other languages
English (en)
Inventor
Yansen LAUW
Peter Leonardus Elisabeth Maria PASMANS
Mark Martinus Maria Janssen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DSM IP Assets BV
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DSM IP Assets BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DSM IP Assets BV filed Critical DSM IP Assets BV
Priority to JP2020569940A priority Critical patent/JP7505412B2/ja
Priority to EP19735354.3A priority patent/EP3821471A1/fr
Priority to US17/252,931 priority patent/US20210151617A1/en
Priority to CN201980045737.6A priority patent/CN112385050B/zh
Publication of WO2020011709A1 publication Critical patent/WO2020011709A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
    • H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
    • H10F19/85—Protective back sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
    • H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
    • H10F19/804—Materials of encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F77/00—Constructional details of devices covered by this subclass
    • H10F77/40—Optical elements or arrangements
    • H10F77/42—Optical elements or arrangements directly associated or integrated with photovoltaic cells, e.g. light-reflecting means or light-concentrating means
    • H10F77/492—Spectrum-splitting means, e.g. dichroic mirrors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/712—Weather resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/52—PV systems with concentrators

Definitions

  • the present invention relates to a near infra-red (NIR) reflective multilayer material sheet.
  • NIR near infra-red
  • the invention further relates to a backsheet suitable for a photovoltaic module comprising the NIR-reflective multi-layer material sheet; and to a photovoltaic module comprising said backsheet.
  • Photovoltaic modules are used for electrical power generation from sunlight and in general consist of a laminate which comprises a solar cell system as the core layer.
  • photovoltaic cells grouped in series through appropriate electrical conductors typically using metallic conductors called “ribbons", are typically encapsulated by an encapsulating material, for example EVA.
  • the encapsulating material enclosing the photovoltaic cells serves as protection against mechanical and weathering-related influences.
  • the core layer is present between a surface layer and a base layer or backsheet, to complete the photovoltaic module.
  • the surface layer, or main surface of the module typically made of glass, covers the surface of the module exposed to the sun and allows the solar light to reach the cells.
  • the base layer or backsheet carries out a multiplicity of tasks. It guarantees protection of the encapsulating material and the solar cells from environmental influences, while simultaneously preventing the electrical connections from oxidizing.
  • the backsheet may also enhance the power output of the module by reflecting light via the front glass towards the solar cells. Typically, the backsheet prevents moisture, oxygen and other factors depending on the atmospheric conditions from damaging the encapsulating material, the solar cells and the electrical connections.
  • the backsheet also provides for electrical insulation for the photovoltaic cells and the corresponding electrical circuits.
  • Photovoltaic modules are traditionally mounted outdoors on rooftops or in wide-open spaces where their exposure to sunlight is maximized. When the intensity of sunlight increases, electrical output from photovoltaic modules also increases. However, the efficiency with which a photovoltaic module converts sunlight into electricity is usually approximately 20 percent. The remaining 80 percent of the sunlight is reflected back or absorbed by the module in the form of heat. Energy that is absorbed in the form of heat results in an increase of the operating temperature of the module. Excessive heat decreases the efficiency of the photovoltaic module which converts sunlight into electricity. A typical operating temperature for most photovoltaic modules is around 40-60°C. Many photovoltaic modules lose about 0.3-0.5 percent efficiency for every degree Celsius that their operating temperature increases. A variety of factors may contribute to an increased operating temperature, such as greater ambient air temperature during the day, radiant heat from ground surfaces and other nearby surfaces which may emit heat generated from sun exposure, and increased temperature of the solar module itself from extended sun exposure.
  • photovoltaic modules are integrated in building structures which comprise for example black backsheets for esthetic reasons. While typically rectangular photovoltaic cells in a photovoltaic module are in close proximity, there are usually small gaps between them that expose the underlying backsheet to sunlight. As much as 10 to 15 % of the total area covered by a typical monocrystalline silicon photovoltaic module comprising 60 or 72 cells, the backsheet is exposed to direct sunlight.
  • photovoltaic modules are integrated in a building structure
  • their backsheets are usually colored, especially dark, for example black, to make the photovoltaic modules blend-in with the existing architectural colors and to provide a more homogeneous appearance.
  • the colored, dark, or even black, appearance of the backsheet is usually generated by coating the backsheet with a pigment such as carbon black or iron oxide, or by mixing these pigments with the polymers the backsheet is made of during the manufacturing of the backsheet.
  • Carbon black absorbs basically all light visible to humans.
  • carbon black also absorbs infrared light, which is electromagnetic radiation with wavelengths longer than that of light generally visible to humans, i.e., with wavelengths ranging from the edge of visible red light at about 750 nm to about 1 mm.
  • infrared light will increase the temperature of the backsheet and, ultimately, the operating temperature of the entire photovoltaic module.
  • black pigments like carbon black, pigments appearing completely white reflect most, and thus absorb very little, light visible to humans, and they also reflect most of the infrared light.
  • backsheets in photovoltaic modules are desirable for esthetic reasons, such backsheets tend to increase the photovoltaic modules' operating temperature. This reduces the photovoltaic modules' efficiency in converting sun light into electricity.
  • black backsheets also absorb IR and visible light which further reduces the overall efficiency of the photovoltaic modules.
  • Photovoltaic module backsheets comprising NIR-reflective pigments are known.
  • US 2013/276876 describes a backsheet for a photovoltaic module comprising a black (low colour reflective) infra-red reflective layer. Optionally this may be backed with a white layer.
  • EP2860764 describes a backsheet having a first (front) layer which is black but transmits NIR and a second (rear) layer which reflects NIR.
  • the object of the present invention is thus to provide an NIR-reflective multi-layer backsheet that lowers absorption of NIR light in the backsheet.
  • a further object of the present invention is to provide a NIR-reflective multi-layer backsheet that when applied in a PV (photovoltaic) module will increase the module efficiency through increased light absorption in the solar cells and lowering of the operating temperature.
  • a multi-layer material sheet is comprising an NIR-reflective, translucent polymeric layer having a reflectance of more than 20% of all light with a wavelength from 750 nm to 1000 nm and a transmission of more than 50% of all light with a wavelength from 380 nm to 750 nm and an NIR-reflective, colored polymeric layer having a reflectance of more than 25% of all light with a wavelength from 1000 nm to 2100 nm.
  • the NIR-reflective colored polymeric layer has a reflectance of less than 35% of all light with a wavelength from 380 nm to 750 nm.
  • electromagnetic radiation is classified according to its wavelength into radio waves, microwaves, infrared light, visible light, ultraviolet light, X- rays and gamma rays.
  • Visible light to the human eye is electromagnetic radiation with a wavelength in the range from about 380 nm to about 750 nm.
  • Near Infrared (NIR) light is electromagnetic radiation with a wavelength longer than that of visible light.
  • near infrared light is considered to have a wavelength in the range from about 750 nm to about 2100 nm.
  • the light can be reflected by the object, go through the object (i.e. , be transmitted by the object) or be absorbed by the object.
  • the color a human eye perceives an object to be is determined by the wavelength of the visible light that strikes the object and by the wavelength of the visible light that is reflected by the object into the human eye.
  • the reflection of near infrared light can be enhanced by providing a multi-layer material sheet comprising an NIR- reflective, translucent polymeric layer and an NIR-reflective, colored polymeric layer.
  • translucent means translucent for visible light.
  • the term colored encompasses black. Accordingly, the term NIR-reflective, colored polymeric layer encompasses an NIR-reflective, black polymeric layer. Colored preferably is black.
  • transmittance is measured by using integrating sphere apparatus according to IS013468-2, at a sample thickness of 100 pm unless specified otherwise.
  • reflectance is measured by using integrating sphere apparatus based on a method according to IS013468-2, at a sample thickness of 100 pm unless specified otherwise.
  • the NIR-reflective, translucent polymeric layer is preferably facing the cells and preferably situated on top of the NIR-reflective, colored layer.
  • the benefit of the NIR-reflective, translucent polymeric layer on top of a colored layer is in enhancing the performance of the back sheet providing an increased power output, reduced built- up heat whilst maintaining the colorful appearance of the colored layer.
  • Due to its NIR- reflective property, the introduction of NIR-reflective, translucent polymeric layer increases the total reflected light in the near infra-red (NIR) range (750 nm - 1000 nm) which in turn will increase the total power output of the PV cell and reduces the build- up of heat.
  • NIR near infra-red
  • the relative gain of the PV module, in power output (measured according to IEC 61215) by the introduction of an NIR-reflective, translucent layer on top of a NIR-reflective, black layer in the backsheet compared to a non-NIR-reflective, black layer may be more than 0.2%, more preferably more than 0.5% and even more preferably more than 1.0%.
  • the increase may vary as a function of total loading of pigment and thickness of the NIR-reflective layer, and depends on the design of the photovoltaic module.
  • the NIR-reflective, translucent polymeric layer and the NIR-reflective, colored polymeric layer may be adjacent to each other. It is also possible that the NIR- reflective, translucent polymeric layer and the NIR-reflective, colored polymeric layer may be separated by an adhesive; in other words, the polymeric layers comprise a connecting or adhesive layer in between.
  • the NIR-reflective translucent polymeric layer is preferably facing the cells.
  • the NIR-reflective, colored polymeric layer is preferably situated in-between the NIR-reflective, translucent polymeric layer and an outside layer of the backsheet.
  • the NIR-reflective, translucent polymeric layer preferably comprises an inorganic near infrared-reflective pigment or inorganic near infrared-reflective pigments.
  • the inorganic near infrared-reflective pigments are selected from the group consisting of mica, S1O2, T1O2, tin oxide (SnO or SnC ⁇ ), ZnO, ZnSnO, aluminium-doped ZnO, indiumtinoxide, antimonytinoxide, Zr0 2 ,. iron oxide black Fe30 4 (magnetite), chromium oxide green 0G ⁇ 03 or chromium iron brown (Fe, 0)203 and mixtures thereof.
  • the inorganic near infrared-reflective pigment is selected from the group consisting of mica, S1O2, T1O2, tin oxide (SnO or Sn0 2 ), ZnO, ZnSnO, aluminium-doped ZnO, indiumtinoxide, antimonytinoxide, ZrO ⁇ and mixtures thereof.
  • the NIR-reflective, translucent polymeric layer comprises an NIR reflecting pigment selected from mica and S1O2.
  • a commercially known composition comprising suitable pigments is Iriotec®, for example Iriotec ® 9870.
  • Iriotec® 9870 comprises mica + S1O2, T1O2 (rutile), SnCte and ZrCte.
  • the NIR-reflective, translucent polymeric layer may comprise from 0.1 wt.% to 8 wt.% of the inorganic NIR-reflective pigment based on the total weight of the NIR-reflective, translucent polymeric layer. More preferably the NIR- reflective, translucent polymeric layer comprises from 0.15 wt.% to 6 wt.% of the inorganic NIR-reflective pigment. Still more preferably the NIR-reflective, translucent polymeric layer comprises from 0.2 wt.% to 4 wt.% of the inorganic NIR-reflective pigment.
  • the NIR-reflective, translucent polymeric layer according to the present invention is preferably a thin film layer; preferably with a thickness of less than 300 pm; which is transparent to visible light with a total (regular & diffuse) transmittance > 50 %, as measured by using integrating sphere apparatus according to IS013468-2.
  • the thickness is from 5 to 200 pm; more preferably from 10 to 150 pm; more preferably from 20 to 100 pm; most preferably 30 to 80 pm.
  • total transmittance is at least 60 %; more preferably at least 70 %, for example at least 80 %, or even at least 90 %.
  • the reflectance of the NIR-reflective, translucent polymeric layer for light having a wavelength from 750 nm to 1000 nm is more than 30 %;
  • the NIR-reflective, translucent polymeric layer preferably comprises a thermoplastic polymer.
  • the thermoplastic polymer is typically selected from the group consisting of a polyolefin, a mixture of polyolefins, a TPO or a blend from a polyolefin and a semi-crystalline polymer.
  • the thermoplastic polymer is preferably a polyolefin or a mixture of polyolefins.
  • the polyolefin is preferably selected from the group consisting of optionally functionalized polyethylene homo or copolymers, optionally functionalized polypropylene homo or (block-)copolymers, cyclic olefin copolymers,
  • thermoplastic polyolefine a thermoplastic polyolefine (TPO) or blends thereof.
  • thermoplastic polyolefin as described herein means for example PP/EPR reactor blends resins (such as Hifax CA 10, Hifax CA 12, Hifax CA 02, Hifax CA 60, supplied by Basell) or elastomeric polypropylene (PP) resins (known under the trade name Versify 2300.01 or 2400.01 in mixture with e.g. random PP copolymers) or thermoplastic vulcanisates (known under the trade name Santoprene)
  • Examples of functionalized polyethylene or polypropylene homo-or (block-)copolymers are for example ethylene or propylene copolymerized with polar co monomers chosen from maleic acid anhydride, vinyl acetate, acrylic and methacrylic ester such as methylacrylate, ethylacrylate, butylacrylate or ethylhexylacrylate.
  • polar co monomers chosen from maleic acid anhydride, vinyl acetate, acrylic and methacrylic ester such as methylacrylate, ethylacrylate, butylacrylate or ethylhexylacrylate.
  • ethylene is co-polymerised with methylacrylate.
  • the NIR-reflective, translucent polymeric layer comprises a functionalized polyethylene, polyethylene and optionally polypropylene.
  • the NIR-reflective, colored polymeric layer comprises a polymeric material and at least one NIR-reflective pigment.
  • the layer is also colored. Accordingly, it typically comprises a colored pigment.
  • the NIR-reflective pigment and the colored pigment may the same.
  • the NIR-reflective, colored polymeric layer preferably comprises a polymeric material and at least one NIR-reflective, colored pigment.
  • the NIR-reflective, colored polymeric layer according to the present invention typically has a thickness of from 50 to 600 pm; more preferably from 100 to 400 pm; most preferably from 200 to 300 pm.
  • the NIR-reflective, colored polymeric layer according to the present invention typically has a reflectance of more than 40% of all light with a wavelength of 1000 nm to 2100 nm. More preferably reflectance is more than 50%, more than 60% or even more than 70% of all light with a wavelength of 1000 nm to 2100 nm.
  • the NIR- reflective, colored polymeric layer according to the present invention typically has a reflectance of more than 40% of all light with a wavelength of 1200 nm to 1600 nm. More preferably reflectance is more than 50%, more than 60%, more than 70% or even more than 80% of all light with a wavelength of 1200 nm to 1600 nm.
  • the polymeric material of the NIR-reflective, colored polymeric layer is preferably a thermoplastic polymer.
  • the thermoplastic polymer is selected from the group consisting of a polyolefin, a functionalized polyolefine, polyester, polyamide, rubber modified polyesters, PMMA, PEEK, polycarbonate, polyether sulfone, polyoxymethylene, polyimide, polyphenylene sulfide or polyphenylene oxide.
  • thermoplastic polymer of the NIR-reflective, colored polymeric layer is selected from the group consisting of polyamide, polyester, rubber modified polyester, polyolefin and combinations thereof.
  • polyolefins examples include polyethylene or polypropylene homo-or
  • polystyrene resin (block-)copolymers.
  • polyolefin is polypropylene.
  • functionalized polyolefins are functionalized polyethylene or polypropylene homo-or (block-)copolymers, for example ethylene or propylene copolymerized with polar co-monomers chosen from maleic acid anhydride, vinyl acetate, acrylic and methacrylic ester such as methylacrylate, ethylacrylate, butylacrylate or ethylhexylacrylate.
  • the functionalized polyolefin is propylene co-polymerized with maleic acid anhydride.
  • polyesters include poly(trans-1 ,4-cyclohexylene alkane dicarboxylates such as poly(trans-1 ,4-cyclohexylene succinate) and poly(trans-1 ,4- cyclohexylene adipate), poly(cis or trans-1 ,4-cyclohexanedimethylene),
  • alkanedicarboxylates such as poly(cis 1 ,4-cyclohexanedimethylene)oxalate and poly(cis 1 ,4-cyclohexanedimethylene)succinate
  • poly(alkylene terephthalates) such as polyethyleneterephthalate and polytetramethyleneterephthalate
  • poly(alkylene isophthalates such as polyethyleneisophthalate and polytetramethyleneisophthalate
  • poly(p-phenylene alkanedicarboxylates such as poly(p-phenylene glutarate) and poly(p-phenylene adipate
  • poly(p-xylene oxalate) poly(o-xylene oxalate)
  • poly(p- phenylenedialkylene terephthalates) such as poly(p-phenylenedimethylene
  • Preferred polyesters are poly(alkylene terephthalates) such as
  • the polyester may be impact modified by an elastomer that contains functional groups that bond chemically and/or interact physically with the polyester.
  • the functional groups are chosen from the group consisting of anhydrides, acids, epoxides, silanes, isocyanates, oxazolines, thiols and/or (meth)acrylates.
  • the functional groups are epoxides.
  • the elastomer as mentioned herein means an elastomer chosen from the group consisting of EPDM, SBS, SEBS, ethylene-propylene elastomers such as EPDM, styrene-butadiene elastomers such as SBS or SEBS.
  • the amount of functional groups that bond chemically and/or interact physically with the polyester is preferably from 0.01 to 5 wt.%. (based on the total weight of the impact modified polyester).
  • polyamides are polyamide 6, polyamide 6,6; polyamide 4,6; polyamide 6,10; polyamide 6,12; polyamide 6,14; polyamide 6,13; polyamide 6,15; polyamide 6,16; polyamide 1 1 ;, polyamide 12, polyamide 10, polyamide 9,12, polyamide 9,13, polyamide 9,14, polyamide 9,15, polyamide 6,16, polyamide 10,10, polyamide 10,12, polyamide 10,13, polyamide 10,14, polyamide 12,10, polyamide 12,12, polyamide 12,13, polyamide 12,14, adipic adipamide/terephthalic adipamide copolyamide, terephthalic adipamide/isophthalic adipamide copolyamide, poly(adipic acid meta-dimethylbenzamide), terephthalic adipamide/terephthalic 2- methylglutaramide, adipic adipamide/terephthalic adipamide/isophthalic adipamide copolyamide and polycaprolactam-terephthalic adipamide.
  • the NIR-reflective, colored polymeric layer comprises polypropylene or propylene co-polymerized with maleic acid anhydride.
  • Preferred NIR-reflective, colored pigments, for a dark colored layer are chromium iron oxide like Sicopal Black K0095 from BASF or Shepherd black 10G996 from Shepherd.
  • the NIR-reflective, colored polymeric layer may comprise from 0.1 wt.% to 8 wt.% of the NIR-reflective, colored pigment based on the total weight of the NIR-reflective, colored polymeric layer. More preferably the NIR-reflective, colored polymeric layer comprises from 0.15 wt.% to 6 wt.% of the NIR-reflective, colored pigment. Still more preferably the NIR-reflective, colored polymeric layer comprises from 0.2 wt.% to 4 wt.% of the NIR-reflective, colored pigment.
  • the multi-layer material sheet of the present invention may further comprise other polymeric layers such as one or more adhesive layers, a structural reinforcement layer and/or a weather-resistant layer. Preferably it comprises a weather- resistant layer.
  • the weather-resistant layer may comprise a polyamide, PTFE, a polyolefin or a polyester.
  • suitable polyolefins, polyesters or polyamides are as described earlier.
  • the weather-resistant layer comprises polyamide 12.
  • the weather-resistant layer comprises polypropylene.
  • the weather-resistant layer may further comprise inorganic fillers such as calcium carbonate, titanium dioxide, barium sulfate, mica, talc, kaolin, glass microbeads and glass fibers or additives such as UV stabilizers, heat stabilizers or anti- oxidants. More preferably the weather-resistant layer may be colored by any of the colored (including black) pigments (including IR-reflective, colored pigments) as indicated earlier, or by a white pigment. Most preferably the weather- resistant layer comprises a white pigment.
  • the adhesive layer is the NIR-reflective colored polymeric layer as defined in the present invention.
  • the structural layer is the NIR-reflective colored polymeric layer as defined in the present invention.
  • an adhesive polymeric layer comprising an NIR-reflective pigment of a particular color including dark color
  • an adhesive polymeric layer which can be the same or different than layer (b) e) an air-side facing polymeric layer or weather-resistant layer
  • the layers a) and b) comprise the ingredients as indicated earlier.
  • the adhesive layer is the NIR-reflective, colored polymeric layer as described earlier.
  • the structural layer c) for example comprises a thermoplastic polymer such as polyolefin or a mixture of polyolefin, for example a polypropylene or a mixture of polypropylene, a polyester, for example PET or PBT optionally rubber modified or a polyamide.
  • the structural layer may comprise an NIR-reflective, colored pigment, for example chromium iron oxide, more specifically Sicopal Black K0095 from BasF or Shepherd black 10G996 from Shepherd.
  • the polyester such as PET or PBT may be impact modified by an elastomer that contains functional groups that bond chemically and/or interact physically with the polyester.
  • the functional groups are chosen from the group consisting of anhydrides, acids, epoxides, silanes, isocyanates, oxazolines, thiols and/or (meth)acrylates.
  • the functional groups are epoxides.
  • the elastomer as mentioned herein means an elastomer chosen from the group consisting of EPDM, SBS, SEBS, ethylene-propylene elastomers such as EPDM, styrene-butadiene elastomers such as SBS or SEBS.
  • the amount of functional groups that bond chemically and/or interact physically with the polyester is preferably from 0.01 to 5 wt.% (based on the total weight of the impact modified polyester).
  • polyamides are polyamide 6, polyamide 6,6, polyamide 4,6, polyamide 6,10, polyamide 6,12, polyamide 6,14, polyamide 6,13, polyamide 6,15, polyamide 6,16, polyamide 1 1 , polyamide 12, polyamide 10, polyamide 9,12, polyamide 9,13, polyamide 9,14, polyamide 9,15, polyamide 6,16, polyamide 10,10, polyamide 10,12, polyamide 10,13, polyamide 10,14, polyamide 12,10, polyamide 12,12, polyamide 12,13, polyamide 12,14, adipic adipamide/terephthalic adipamide copolyamide, terephthalic adipamide/isophthalic adipamide copolyamide, poly(adipic acid meta-dimethylbenzamide), terephthalic adipamide/terephthalic 2- methylglutaramide, adipic adipamide/terephthalic adipamide/isophthalic adipamide copolyamide and polycaprolactam-terephthalic adipamide.
  • the air-side facing polymeric layer or weather-resistant layer e) situated at the outside of the backsheet may comprise a polyamide, PTFE, a polyolefine or a polyester.
  • polyamides polyolefins, polyesters or polyamides are as described earlier.
  • the weather-resistant layer e) comprises polyamide 12.
  • the weather-resistant layer comprises a polyolefin, for example polypropylene.
  • the weather-resistant layer e) may further comprise inorganic fillers such as calcium carbonate, titanium dioxide, barium sulfate, mica, talc, kaolin, glass microbeads and glass fibers or additives such as UV stabilizers, heat stabilizers or anti- oxidants. More preferably the weather-resistant layer may be colored by any of the
  • NIR-reflective pigments as indicated earlier, or by a white pigment.
  • the weather-resistant layer e) comprises a white pigment.
  • an adhesive polymeric layer comprising an NIR-reflective pigment of a particular color including dark color
  • a structural polymeric layer comprising a NIR-reflective pigment of a particular color including dark color
  • an adhesive polymeric layer which can be the same or different than layer (b) e) an air-side facing polymeric layer or weather-resistant layer.
  • both adhesive layers comprise comprise a NIR- reflective pigment of a particular color including dark color.
  • the layers a)-e) comprise the ingredients as described earlier.
  • the multi-layer backsheet may comprise the following layers:
  • NIR-reflective translucent polymeric layer facing the cells comprising a NIR-reflective pigment chosen from the group consisting of mica, S1O2, T1O2, tinoxide, ZnO, ZnSnO, aluminium-doped ZnO, indiumtinoxide, antimonytinoxide, ZrO ⁇ or mixtures thereof.
  • an adhesive polymeric layer comprising a NIR-reflective pigment chosen from the group consisting of mica, S1O2, T1O2, tin oxide, ZnO, ZnSnO, aluminium-doped ZnO, indiumtinoxide, antimonytinoxide, ZrO ⁇ or mixtures thereof, Chromium iron oxide like Sicopal Black K0095 from BASF or Shepherd black 10G996 from Shepherd c) a structural polymeric layer comprising a NIR-reflective pigment chosen from
  • Chromium iron oxide like Sicopal Black K0095 from BASF or Shepherd black 10G996 from Shepherd
  • an adhesive polymeric layer which can be the same or different than layer (b) e) an air-side facing polymeric layer or weather-resistant layer, preferably comprising a white pigment.
  • the layers a)-e) comprise the ingredients as described earlier.
  • the polymeric layers in may further comprise additives known in the art.
  • the polymeric layers comprise at least one additive selected from UV stabilizers, UV absorbers, anti-oxidants, thermal stabilizers and/or hydrolysis stabilizers.
  • a polymeric layer may comprise from 0.05 to 10 wt.% additives more preferably from 1 to 5 wt.% additives, based on the total weight of the polymer.
  • White pigments such as talc, mica, T1O2, ZnO or ZnS may also be added.
  • NIR-reflective translucent polymeric layer facing the cells comprising a NIR-reflective pigment chosen from the group consisting of mica, S1O2, T1O2, tinoxide, ZnO, ZnSnO, aluminium-doped ZnO, indiumtinoxide, antimonytinoxide, ZrO ⁇ or mixtures thereof
  • an adhesive polymeric layer comprising a NIR-reflective pigment chosen from chromium iron oxide like Sicopal Black K0095 from BASF or Shepherd black 10G996 from Shepherd
  • a structural polymeric layer comprising a NIR-reflective pigment chosen from chromium iron oxide like Sicopal Black K0095 from BASF or Shepherd black 10G996 from Shepherd d) an adhesive polymeric layer which can be the same or different than layer (b) e) an air-side facing polymeric layer or weather-resistant layer, preferably comprising a white pigment
  • the layers a)-e) comprise the polymeric materials and possible additives as described earlier.
  • the present invention provides a multi-layer material sheet comprising:
  • an NIR-reflective, translucent polymeric layer which layer comprises functionalized polyethylene, polyethylene and optionally polypropylene and an NIR-reflective pigment
  • an NIR-reflective, colored layer which layer comprises a polyolefin, an NIR reflective pigment and a colored pigment
  • the multi-layer material sheet further comprises a weather- resistant layer (c), which layer comprises a polyolefin or a polyamide.
  • a weather- resistant layer c
  • Polyolefin and polyamide is as defined herein.
  • the NIR-reflective, translucent polymeric layer comprises ethylene copolymerized with methacrylate.
  • the NIR-reflective pigment of the NIR-reflective, translucent polymeric layer (a) comprises mica, Si02 or both.
  • the amount of NIR-reflective pigment of the NIR-reflective, translucent polymeric layer (a) is from 0.1 to 8 wt.% based on the total weight of the NIR-reflective, translucent polymeric layer.
  • the NIR-reflective, translucent polymeric layer (a) has a thickness of from 10 to 150 pm.
  • the NIR-reflective, colored layer comprises polypropylene or propylene copolymerized with maleic anhydride.
  • the NIR-reflective pigment is also the colored pigment.
  • the NIR-reflective pigment is present in an amount of from 0.1 to 8 wt.% based on the total weight of the layer.
  • the NIR- reflective, colored layer (b) has a thickness of from 100 to 400 pm.
  • the color is black.
  • the weather-resistant layer comprises polyamide 12 or polypropylene.
  • the weather resistant layer has a thickness of from 10 to 50 pm.
  • the weather-resistant layer comprises a white pigment.
  • a particular preferred embodiment is a multi-layer material sheet as described above, wherein: a) the NIR-reflective, translucent polymeric layer has a thickness of from 10 to 150 pm, comprises ethylene copolymerized with methacrylate, and from 0.1 to 8 wt.% of an NIR-reflective pigment comprising mica and Si02;
  • the NIR-reflective, colored layer (b) has a thickness of from 100 to 400 pm, comprises polypropylene or propylene copolymerized with maleic anhydride, and from 0.1 to 8 wt.% of NIR-reflective pigment which is also a colored pigment;
  • the weathering layer comprises polyamide 12 or
  • the multi-layer material sheet according to the present invention may be prepared using a multi-layer fusion or co-extrusion process.
  • the process comprises the following steps: compounding of the individual formulations of the different layers including inorganic fillers, additives and stabilizers followed by extrusion of the different layers and laminating them.
  • the multi-layer material sheet according to the present invention may also be manufactured by: (1 ) pelletizing the materials of the different layers in an extruder to obtain particles or pellets of the different layers and (2) fusing and co-extruding the pellets or particles, prepared in step (1 ) through the extruder.
  • the multi-layer material sheet is obtained by melt co- extruding of the different layers in the multi-layer material sheet via the following steps: (1 ) preparing the polymer compositions of the different layers by separately mixing the components of the different layers, (2) melting of the different polymer compositions to obtain different melt streams, (3) combining the melt streams by co-extrusion in one extrusion die, (4) cooling the co-extruded layer.
  • the present invention further provides a backsheet suitable for a photovoltaic module, said backsheet comprising a multi-layer materal sheet as defined herein.
  • the multi-layer material sheet is typically suitable for use as a backsheet in a photovoltaic module.
  • the multi-layer material sheet is simply cut to size to produce a backsheet.
  • the multi-layer material sheet is a backsheet suitable for a photovoltaic module.
  • the NIR-reflective, translucent layer is oriented towards the front, i.e. towards the solar cells, and the NIR-reflective, colored layer is oriented towards the back, i.e. away from the solar cells.
  • the present invention further relates to a photovoltaic module comprising the multi-layer material sheet (or backsheet) according to the present invention.
  • the photovoltaic module comprises at least the following layers in order of position from the front sun-facing side to the back non-sun-facing side: (1 ) a transparent front sheet, (2) optionally a front encapsulant layer, (3) a solar cell layer, (4) optionally a back encapsulant layer, and (5) the multi-layer backsheet according to the present invention, representing the rear protective layer of the PV module.
  • the front sheet is typically a glass plate.
  • the front and back encapsulant are designed to encapsulate and protect the fragile solar cells.
  • the "front side” corresponds to a side of the photovoltaic cell irradiated with light, i.e. the light-receiving side
  • the term “backside” corresponds to the reverse side of the light- receiving side of the photovoltaic cells.
  • Suitable encapsulants typically possess a combination of characteristics such as high impact resistance, high penetration resistance, good ultraviolet (UV) light resistance, good long term thermal stability, adequate adhesion strength to glass and/or other rigid polymeric sheets, high moisture resistance, and good long-term weather ability.
  • encapsulants are ionomers, ethylene vinyl acetate (EVA), poly(vinyl acetal), polyvinylbutyral (PVB), thermoplastic polyurethane (TPU), polyvinylchloride (PVC), metallocene-catalyzed linear low density polyethylenes, polyolefin block elastomers, poly(ethylene-co-methyl acrylate) and poly(ethylene-co-butyl acrylate), silicone elastomers or epoxy resins.
  • EVA is the most commonly used encapsulant material. EVA sheets are usually inserted between the solar cells and the top surface (called front encapsulant) and between the solar cells and the rear surface (called a back encapsulant).
  • the solar cells in the solar cell layer may be any kind of solar cells, such as thin-film solar cells (for example copper indium gallium selenide solar cells and cadmium telluride solar cells) and wafer- based solar cells.
  • thin-film solar cells for example copper indium gallium selenide solar cells and cadmium telluride solar cells
  • wafer- based solar cells wafer- based solar cells.
  • the present invention further relates to a multi-layer backsheet for a photovoltaic module comprising a NIR reflective translucent polymeric layer having a reflectance of more than 20% of all light with a wavelength from 750 nm to 1000 nm and a transmission of more than 50% of all light with a wavelength from 380 nm to 750 nm and a colored polymeric layer having a reflectance of less than 35% of all light with a wavelength from 380 nm to 2100 nm.
  • the colored polymeric layer comprises carbon black.
  • the NIR reflective translucent polymeric layer and the colored polymeric layer are composed of the materials as described earlier.
  • the multi-layer material sheet may also further comprise at least an adhesive layer, a structural layer and a weather-resistant layer.
  • the colored polymeric layer has a reflectance of less than 30 % of all light with a wavelength from 380 nm to 2100 nm; more preferably less than 25 %; still more preferably less than 20 %.
  • total transmittance of the NIR-reflective, translucent polymeric layer of all light with a wavelength from 380 nm to 750 nm is at least 60 %, preferably at least 70 %; more preferably at least 80 %, for example at least 90 %.
  • the reflectance of the NIR-reflective, translucent polymeric layer for light having a wavelength from 750 nm to 1000 nm is more than 30 %;
  • NIR-reflective translucent polymeric layer facing the cells comprising a NIR-reflective pigment chosen from the group consisting of mica, S1O2, T1O2, tinoxide, ZnO, ZnSnO, aluminium-doped ZnO, indiumtinoxide, antimonytinoxide, ZrO ⁇ or mixtures thereof
  • an adhesive polymeric layer comprising a NIR-reflective pigment chosen from the group consisting of mica, S1O2, T1O2, tinoxide, ZnO, ZnSnO, aluminium-doped ZnO, indiumtinoxide, antimonytinoxide, ZrO ⁇ or mixtures thereof, chromium iron oxide like Sicopal Black K0095 from BASF or Shepherd black 10G996 from Shepherd
  • a structural polymeric layer comprising carbon black
  • an adhesive polymeric layer which can be the same or different than layer (b) e) an air-side facing polymeric layer or weather-resistant layer, preferably comprising a white pigment
  • the multi-layer backsheet comprises the following layers;
  • NIR-reflective translucent polymeric layer facing the cells comprising an NIR- reflective pigment chosen from the group consisting of mica, S1O2, T1O2, tin oxide, ZnO, ZnSnO, aluminium-doped ZnO, indiumtinoxide, antimonytinoxide, ZrO ⁇ or mixtures thereof
  • an adhesive polymeric layer which can be the same or different than layer (b) e) an air-side facing polymeric layer or weather-resistant layer, preferably comprising a white pigment
  • Fig. 1 is a plot of reflectivity against wavelength for the film of Example 3, an NIR-reflective, translucent polymeric layer.
  • Fig. 2 is a plot of transmittance against wavelength for the film of
  • Example 3 an NIR-reflective, translucent polymeric layer.
  • Fig. 3 is a plot of reflectivity against wavelength for the film of Example 4, an NIR-reflective, colored polymeric layer.
  • Fig. 4 is a plot of reflectivity against wavelength for the co-extruded film of Example 5, a multi-layer material sheet.
  • Fig. 5 is a plot of reflectivity against wavelength for the co-extruded film of Examples 6, 7, 8, multi-layer material sheets, and Comparative Experiment 1.
  • Fig. 6 is a plot of reflectivity against wavelength for the film of Example 4, an NIR-reflective, colored polymeric layer.
  • Fig. 7 is a plot of reflectivity against wavelength for the film of
  • Example 4 an NIR-reflective, colored polymeric layer.
  • Fig. 8 shows an example multi-layer material sheet according to the present invention.
  • a functional layer (1 ) is connected to a structure-reinforcing layer (3) through a tie-layer (2).
  • a weather resistant layer (5) is connected to the other side of the structure-reinforcing layer (3) via a second tie layer (4).
  • Granulate of NIR-reflective translucent polymeric material was produced by addition of Iriotec® 9870 powder to a powder of a polymeric mixture of 70 wt% polyethylene and a 30 wt% polyethylene copolymer including additives into a twin-screw extruder equipped with feeders, an 18 mm screw containing elements for mixing, melting and transport of the melt, vacuum dome, atmospheric degassing and a die-plate of 1 x 4 mm. After the die in consecutive order a 1.5 m long water bath, an air knife and pelletizer was installed. Total concentration of Iriotec® 9870 in the compound was 3 wt% in relation to the total weight of the polymeric material. All materials were dosed on the throat.
  • Temperatures of zone 1 is set to 200°C, the other zones were set to 230°C.
  • Temperature of the melt measured upon exiting the die is 270°C.
  • Extruder was set to 300RPM and the throughput is 5 kg/hr. Vacuum was set to -0.7 bar.
  • Granulate of NIR-reflective black polymeric material was produced by addition of Shepherd Black BK10G966 powder to polypropylene including additives as a powder into a twin-screw extruder equipped with feeders, an 18 mm screw containing elements for mixing, melting and transport of the melt, vacuum dome, atmospheric degassing and a die-plate of 1 x 4 mm. After the die in consecutive order a 1.5 m long water bath, an air knife and pelletizer was installed. Total concentration of Shepherd Black BK10G966 in the compound is 8 wt% in relation to the total weight of the polymeric material. All materials were dosed on the throat. Temperature of zone 1 was set to 200°C the other zones were set to 230°C. Temperature of the melt measured upon exiting the die was 270°C. Extruder was set to 300RPM and the throughput was 5 kg/hr. Vacuum was set to -0.7 bar.
  • Example 3 Film processing of the NIR-reflective, translucent granulate 1
  • Granulate 1 (Example 1 ) was processed into a cast film of approximately 20 pm thickness by using a Collin flat line set-up equipped with a single screw extruder 30/25D with a 3-stage screw, feed block, flat coat die of 300 x 0.4 mm and a take-off device. Cylinder temperatures went from water cooled at the intake till 225°C at the end. Connector, feed block and die temperatures were set till 225 °C. Take off speed was 5 m/min. Screw speed was 15 RPM.
  • Example 4 Film processing of the NIR-reflective, black granulate 2
  • Granulate 2 (example 2) was processed into a cast film of approximately 150 pm thickness by using a Collin flat line set-up equipped with a single screw extruder 30/25D with a 3-stage screw, feed block, flat coat die of 300 x 0.4 mm and a take-off device. Cylinder temperatures went from water cooled at the intake till 225°C at the end. Connector, feed block and die temperatures were set till 225°C. Take off speed was 3 m/min. Screw speed was 60 RPM. Total reflectivity of this film was measured using integrating sphere apparatus and based on ISO 13468-2 at 150 pm thickness and is shown in Fig. 3.
  • Granulates 1 and 2 were coextruded into a multi-layer cast film of 170 pm thickness by using a Collin flat film line with a multi-layer set up with 2 extruders.
  • Extruder A was a single screw extruder 30/25D with a 3-stage screw.
  • Extruder B was a single screw extruder 25/25D also with a 3-stage screw. It was further equipped with a feed block 2- layer set-up, a flat coat die 300 x 0.4 mm and a take-off device. Cylinder temperatures change from water cooled at the intake till 225°C at the end. Connector, feed block and die temperatures were set till 225 °C. Take off speed was 3 m/min.
  • Granulate 2 was fed onto extruder A and screw speed was 60 RPM which gives a thickness of 150 pm.
  • Granulate 1 was fed on extruder B and screw speed was 16 RPM which gives a thickness of 20 pm.
  • Total reflectivity of this film is measured with the NIR-reflective translucent layer towards the light source using integrating sphere apparatus and based on ISO 13468-2 at 170 pm thickness and is shown in Fig. 4. Examples 6 to 8
  • the pellets were fed to one of multiple extruders, melt-extruded at a high temperature, passed through an adapter and a die, cooled by a cooling roller and shaped into a multi-layer film having a total thickness of 300 pm.
  • Each example had, in order, the following composition:
  • Examples 6, 7, 8 and Comparative Example 1 The total reflectivity of each of Examples 6, 7, 8 and Comparative Example 1 was measured using integrating sphere apparatus and based on ISO 13468-2, with the functional polymeric layer towards the light source. The results are shown in Fig. 5. Examples 6, 7 and especially 8 give higher total reflectance in the NIR region from 750 nm till 1000 nm. Examples 6, 7 and especially 8 give higher total reflectance in the NIR region from 750 nm till 1000 nm. This wavelength range is most relevant, since this range is above the visible spectral range for the human eye (approximately 380-740 nm) and in this range the (external) quantum efficiency for a typical silicon solar cell is relatively high (>90%).
  • a strand of NIR-reflective polymeric material was produced by addition of Shepherd Green 10C650 powder to a powder of a polymeric mixture of 70 wt.% polyethylene and a 30 wt.% polyethylene copolymer including additives.
  • the mixture was introduced into a small-scale twin-screw extruder.
  • the total concentration of Shepherd Green 10C650 in the compound was 8 wt.% in relation to the total weight of the polymeric material.
  • the mixture was melt extruded at 175°C and 200 rpm over 2 minutes, wherein the material is collected as a strand.
  • a film was pressed from this strand by placing approximately 1 gram into a precut aluminum mold with dimensions 100 mm x 100 mm x 65 pm.
  • Pressing was carried out using a THB400 handheld press at 175°C for 3 minutes. Pressure was increased stepwise from 100 to 200 and finally 300 kN. Each step lasted 1 minute. After 3 minutes, the sample was cooled under pressure to room temperature. A film having a thickness of 100 pm was obtained. The total reflectivity of the film was measured using integrating sphere apparatus and based on ISO 13468-2 and is shown in the Fig. 6. A green-coloured film showing significant reflectivity above 750 nm wavelength was produced.
  • Example 10 NIR-reflective orange-colored polymeric layer
  • Example 9 was repeated except that 8 wt.% Shepherd Orange 10P340 powder was used in place of 8 wt.% Shepherd Green 10C650.
  • Total reflectivity of the film was measured using integrating sphere apparatus and based on ISO 13468-2 and is shown in the Fig. 7. An orange-coloured film showing significant reflectivity above 600 nm wavelength was produced.

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Abstract

La présente invention concerne une feuille de matériau multicouche comprenant un réflecteur NIR, une couche polymère translucide ayant une réflectance supérieure à 20 % de la totalité de la lumière ayant une longueur d'onde de 750 nm à 1000 nm et une transmission de plus de 50 % de la totalité de la lumière ayant une longueur d'onde de 380 nm à 750 nm et une réflexion NIR, des couches polymère colorées ayant un facteur de réflexion supérieur à 25 % de la totalité de la lumière ayant une longueur d'onde de 1000 nm à 2100 nm. La présente invention concerne également une feuille arrière appropriée pour être utilisée dans un module photovoltaïque, ladite feuille arrière comprenant ladite feuille de matériau multicouche ; et un module photovoltaïque comprenant ladite feuille arrière.
PCT/EP2019/068249 2018-07-10 2019-07-08 Feuille de matériau multicouche réfléchissant nir Ceased WO2020011709A1 (fr)

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US17/252,931 US20210151617A1 (en) 2018-07-10 2019-07-08 Nir-reflective multi-layer material sheet
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